-- Time Entries table for Autotask sync
-- This migration creates the time_entries table with proper indexing and foreign keys

CREATE TABLE IF NOT EXISTS time_entries (
    id BIGINT PRIMARY KEY,
    resource_id BIGINT NOT NULL,
    ticket_id BIGINT,
    task_id BIGINT,
    project_id BIGINT,
    company_id BIGINT,
    entry_date TIMESTAMP NOT NULL,
    hours_worked DECIMAL(10,2) NOT NULL,
    notes TEXT,
    internal_notes TEXT,
    title VARCHAR(255),
    type INTEGER,
    start_date_time TIMESTAMP,
    end_date_time TIMESTAMP,
    billable BOOLEAN DEFAULT true,
    billing_rate DECIMAL(15,2),
    billing_rate_currency_id INTEGER,
    cost_rate DECIMAL(15,2),
    cost_rate_currency_id INTEGER,
    cost DECIMAL(15,2),
    cost_currency_id INTEGER,
    revenue DECIMAL(15,2),
    revenue_currency_id INTEGER,
    margin DECIMAL(15,2),
    margin_currency_id INTEGER,
    approved BOOLEAN DEFAULT false,
    approved_by_resource_id BIGINT,
    approved_date_time TIMESTAMP,
    non_billable BOOLEAN DEFAULT false,
    contract_service_id BIGINT,
    contract_service_bundle_id BIGINT,
    role_id BIGINT,
    department_id INTEGER,
    location_id BIGINT,
    allocation_code_id BIGINT,
    imp_project_schedule_id BIGINT,
    imp_project_schedule_task_id BIGINT,
    api_vendor_id INTEGER,
    -- Audit fields
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    synced_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    is_deleted BOOLEAN DEFAULT false,
    deleted_at TIMESTAMP,
    FOREIGN KEY (resource_id) REFERENCES resources(id) ON DELETE CASCADE,
    FOREIGN KEY (ticket_id) REFERENCES tickets(id) ON DELETE SET NULL,
    FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE SET NULL,
    FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE SET NULL,
    FOREIGN KEY (company_id) REFERENCES companies(id) ON DELETE SET NULL,
    FOREIGN KEY (approved_by_resource_id) REFERENCES resources(id) ON DELETE SET NULL
    -- Note: Foreign keys for contract_services, contract_service_bundles, roles, locations, 
    -- and allocation_codes are omitted as these tables don't exist yet.
    -- These can be added in a future migration when those tables are created.
);

-- Indexes for performance
CREATE INDEX IF NOT EXISTS idx_time_entries_resource_id ON time_entries(resource_id);
CREATE INDEX IF NOT EXISTS idx_time_entries_ticket_id ON time_entries(ticket_id);
CREATE INDEX IF NOT EXISTS idx_time_entries_task_id ON time_entries(task_id);
CREATE INDEX IF NOT EXISTS idx_time_entries_project_id ON time_entries(project_id);
CREATE INDEX IF NOT EXISTS idx_time_entries_company_id ON time_entries(company_id);
CREATE INDEX IF NOT EXISTS idx_time_entries_entry_date ON time_entries(entry_date);
CREATE INDEX IF NOT EXISTS idx_time_entries_start_date_time ON time_entries(start_date_time);
CREATE INDEX IF NOT EXISTS idx_time_entries_end_date_time ON time_entries(end_date_time);
CREATE INDEX IF NOT EXISTS idx_time_entries_is_active ON time_entries(is_deleted);
CREATE INDEX IF NOT EXISTS idx_time_entries_synced_at ON time_entries(synced_at);
CREATE INDEX IF NOT EXISTS idx_time_entries_created_at ON time_entries(created_at);

-- Composite indexes for common queries
CREATE INDEX IF NOT EXISTS idx_time_entries_resource_date ON time_entries(resource_id, entry_date);
CREATE INDEX IF NOT EXISTS idx_time_entries_ticket_date ON time_entries(ticket_id, entry_date);
CREATE INDEX IF NOT EXISTS idx_time_entries_project_date ON time_entries(project_id, entry_date);
CREATE INDEX IF NOT EXISTS idx_time_entries_company_date ON time_entries(company_id, entry_date);

-- Comments for documentation
COMMENT ON TABLE time_entries IS 'Autotask time entries with analytics support';
COMMENT ON COLUMN time_entries.hours_worked IS 'Hours worked for this time entry';
COMMENT ON COLUMN time_entries.notes IS 'Public notes for the time entry';
COMMENT ON COLUMN time_entries.internal_notes IS 'Internal notes for the time entry';
COMMENT ON COLUMN time_entries.billable IS 'Whether this time entry is billable';
COMMENT ON COLUMN time_entries.approved IS 'Whether this time entry has been approved';
COMMENT ON COLUMN time_entries.non_billable IS 'Whether this time entry is marked as non-billable';
COMMENT ON COLUMN time_entries.is_deleted IS 'Soft delete flag - true if deleted in Autotask';
COMMENT ON COLUMN time_entries.synced_at IS 'Last time this record was synced from Autotask';